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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using SFML;
using SFML.Graphics;
using SFML.System;
using SFML.Window;
namespace Chip8
{
public class Chip8
{
public byte[] ram = new byte[4096];
public byte[] regs = new byte[16];
public int pc;
public byte stackPointer;
public ushort[] stack = new ushort[16];
//timer registers and timers here later
public byte delayTimer, soundTimer;
public int regI;
public byte[,] display = new byte[64, 32];
public int waitingForInputKey = -1;
public bool waitingForInput = false;
public bool[] inputs = new bool[16];
public bool displayUpdated = false;
public Chip8(byte[] programCode)
{
byte[] font =
{
0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
0x20, 0x60, 0x20, 0x20, 0x70, // 1
0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
0x90, 0x90, 0xF0, 0x10, 0x10, // 4
0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
0xF0, 0x10, 0x20, 0x40, 0x40, // 7
0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
0xF0, 0x90, 0xF0, 0x90, 0x90, // A
0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
0xF0, 0x80, 0x80, 0x80, 0xF0, // C
0xE0, 0x90, 0x90, 0x90, 0xE0, // D
0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
0xF0, 0x80, 0xF0, 0x80, 0x80 // F
};
for (int i = 0; i < font.Length; i++)
{
ram[i] = font[i];
}
for (int i = 0x200; i < 0xFFF; i++)
{
if ((i - 0x200) >= programCode.Length)
break;
ram[i] = programCode[i - 0x200];
}
pc = 0x200;
}
public void Execute()
{
//while (delayTimer > 0)
if (delayTimer > 0)
delayTimer--;
if (soundTimer > 0)
soundTimer--;
byte lowbyte = ram[pc + 1];
byte highbyte = ram[pc];
ushort currentRegister = BitConverter.ToUInt16(new byte[] { lowbyte, highbyte }, 0);
int nnn = currentRegister & (0b0000111111111111);
int n = currentRegister & (0b0000000000001111);
int x = (currentRegister & (0b0000111100000000)) >> 8;
int y = (currentRegister & (0b0000000011110000)) >> 4;
int insType1 = currentRegister & (0b1111000000000000);//highbyte & (0b11110000);
int insType2 = currentRegister & (0b0000000000001111);
byte kk = ram[pc + 1];
// Console.Write("PC: " + pc + " ");
if (currentRegister == 0x00E0)
{
for (int x_ = 0; x_ < 64; x_++)
for (int y_ = 0; y_ < 32; y_++)
{
display[x_, y_] = 0;
}
pc += 2;
}
else if (currentRegister == 0x00EE)
{
pc = stack[stackPointer];
stackPointer--;
}
else
switch (insType1)
{
case 0x1000:
//jump
pc = nnn;
break;
case 0x2000:
//call
stackPointer++;
stack[stackPointer] = (ushort)(pc + 2);
pc = nnn;
break;
case 0x3000:
// Console.WriteLine("SE V" + x + " " + kk);
if (regs[x] == kk)
pc += 2;
pc += 2;
break;
case 0x4000:
// Console.WriteLine("SNE V" + x + " " + kk);
if (regs[x] != kk)
pc += 2;
pc += 2;
break;
case 0x5000:
// Console.WriteLine("SE V" + x + " V" + y);
if (regs[x] == regs[y])
pc += 2;
pc += 2;
break;
case 0x6000:
// Console.WriteLine("LD V" + x + " " + kk);
regs[x] = kk;
pc += 2;
break;
case 0x7000:
//Console.WriteLine("ADD V" + x + " " + kk);
regs[x] += kk;
pc += 2;
break;
case 0x8000:
switch (insType2)
{
case 0:
regs[x] = regs[y];
pc += 2;
break;
case 1:
//Console.WriteLine("OR V" + x + " V" + y);
regs[x] |= regs[y]; pc += 2;
break;
case 2:
//Console.WriteLine("AND V" + x + " V" + y);
regs[x] &= regs[y]; pc += 2;
break;
case 3:
//Console.WriteLine("XOR V" + x + " V" + y);
regs[x] ^= regs[y]; pc += 2;
break;
case 4:
// Console.WriteLine("ADD V" + x + " V" + y);
byte added = (byte)(regs[x] + regs[y]);
if (regs[x] + regs[y] > 255)
regs[0xF] = 1;
else regs[0xF] = 0;
regs[x] = added;
pc += 2;
break;
case 5:
//Console.WriteLine("SUB V" + x + " V" + y);
if (regs[x] > regs[y])
regs[0xF] = 1;
else regs[0xF] = 0;
regs[x] -= regs[y];
pc += 2;
break;
case 6:
//Console.WriteLine("SHR V" + x + " V" + y);
//set VF based on leastsignificant bit, weird shit
if ((regs[x] & 1) == 1)
regs[0xF] = 1;
else regs[0xF] = 0;
regs[x] /= 2;
pc += 2;
break;
case 7:
//Console.WriteLine("SUBN V" + x + " V" + y);
if (regs[x] < regs[y])
regs[0xF] = 1;
else regs[0xF] = 0;
byte test = regs[y];
test -= regs[x];
regs[x] = test; //i couldnt cast simply (regs[y] - regs[x]) for some reason lol
pc += 2;
break;
case 0xE:
//Console.WriteLine("SHL V" + x + " V" + y);
if ((regs[x] >> 7) == 1)
regs[0xF] = 1;
else regs[0xF] = 0;
regs[x] *= 2;
pc += 2;
break;
}
break;
case 0x9000:
//Console.WriteLine("SNE V" + x + " V" + y);
if (regs[x] != regs[y])
pc += 2;
pc += 2;
break;
case 0xA000:
//Console.WriteLine("LD I " + nnn);
regI = nnn;
pc += 2;
break;
case 0xB000:
// Console.WriteLine("JP V0 " + nnn);
pc = regs[0] + nnn;
pc += 2;
break;
case 0xC000:
{
//Console.WriteLine("RND V" + x + " " + kk);
Random rand = new Random();
regs[x] = (byte)(rand.Next(255) & kk);
pc += 2;
}
break;
case 0xD000:
{
//Console.WriteLine("DRW V" + x + " V" + y + " " + n);
regs[0xF] = 0;
for (int _y = 0; _y < n; _y++)
{
byte sprByte = ram[regI + _y];
for (int _x = 0; _x < 8; _x++)
{
if (display[(_x + regs[x]) % 64, (_y + regs[y]) % 32] == 1)
regs[0xF] = 1;
if ((sprByte & (0x80 >> _x)) != 0)
{
display[(_x + regs[x]) % 64, (_y + regs[y]) % 32] ^= 1;
}
}
}
displayUpdated = true;
pc += 2;
}
break;
case 0xE000:
switch (lowbyte)
{
case 0x9E:
{
//Console.WriteLine("SKP V" + x);
if (inputs[regs[x] - 1])
pc += 2;
pc += 2;
}
break;
case 0xA1:
// Console.WriteLine("SKNP V" + x);
if (!inputs[regs[x] - 1])
pc += 2;
pc += 2;
break;
}
break;
case 0xF000:
switch (lowbyte)
{
case 0x07:
regs[x] = delayTimer;
pc += 2;
break;
case 0x0A: //UNIMPLEMENTED
//Console.WriteLine("LD V" + x + " K");
bool pressed = false;
for (int i = 0; i < 16; i++)
{
if (inputs[i] == true)
{
regs[x] = (byte)i;
pressed = true;
}
}
if (!pressed)
return;
pc += 2;
break;
case 0x15:
// Console.WriteLine("LD DT, V" + x);
delayTimer = regs[x];
pc += 2;
break;
case 0x18:
//Console.WriteLine("LD ST, V" + x);
soundTimer = regs[x];
pc += 2;
break;
case 0x1E:
//Console.WriteLine("ADD I, V" + x);
regI += regs[x];
pc += 2;
break;
case 0x29:
//Console.WriteLine("LD F, V" + x);
regI = regs[x] * 5;
pc += 2;
break;
case 0x33:
//Console.WriteLine("LD B, V" + x);
ram[regI + 0] = (byte)((regs[x] / 100));
ram[regI + 1] = (byte)((regs[x] / 10) % 10);
ram[regI + 2] = (byte)(regs[x] % 10);
pc += 2;
break;
case 0x55:
//Console.WriteLine("LD [I], V" + x);
for (int i = 0; i < x + 1; i++)
ram[regI + i] = regs[i];
// regI += x + 1;
pc += 2;
break;
case 0x65:
//Console.WriteLine("LD V" + x + " [I]");
for (int i = 0; i < x + 1; i++)
regs[i] = ram[regI + i];
//regI += x + 1;
pc += 2;
break;
}
break;
default:
Console.WriteLine("unknown: " + currentRegister.ToString("X"));
break;
}
//Thread.Sleep(1200);
}
public void PrintDisassembly()
{
while (pc < 0xFFF)
{
byte lowbyte = ram[pc + 1];
byte highbyte = ram[pc];
short currentRegister = BitConverter.ToInt16(new byte[] { lowbyte, highbyte }, 0);
int nnn = currentRegister & (0b0000111111111111);
int n = currentRegister & (0b0000000000001111);
int x = (currentRegister & (0b0000111100000000)) >> 8;
int y = (currentRegister & (0b0000000011110000)) >> 4;
int insType1 = currentRegister & (0b1111000000000000);//highbyte & (0b11110000);
int insType2 = currentRegister & (0b0000000000001111);
byte kk = ram[pc + 1];
Console.Write("PC: " + pc + " ");
if (currentRegister == 0x00E0)
Console.WriteLine("CLS");
else if (currentRegister == 0x00EE)
Console.WriteLine("RET");
else if (insType1 == 0x1000)
Console.WriteLine("JP " + nnn);
else if (insType1 == 0x2000)
Console.WriteLine("CALL " + nnn);
else if (insType1 == 0x3000)
Console.WriteLine("SE V" + x + " " + kk);
else if (insType1 == 0x4000)
Console.WriteLine("SNE V" + x + " " + kk);
else if (insType1 == 0x5000)
Console.WriteLine("SE V" + x + " V" + y);
else if (insType1 == 0x6000)
Console.WriteLine("LD V" + x + " " + kk);
else if (insType1 == 0x7000)
Console.WriteLine("ADD V" + x + " " + kk);
else if (insType1 == 0x8000 && insType2 == 0)
Console.WriteLine("LD V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 1)
Console.WriteLine("OR V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 2)
Console.WriteLine("AND V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 3)
Console.WriteLine("XOR V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 4)
Console.WriteLine("ADD V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 5)
Console.WriteLine("SUB V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 6)
Console.WriteLine("SHR V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 7)
Console.WriteLine("SUBN V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 0xE)
Console.WriteLine("SHL V" + x + " V" + y);
else if (insType1 == 0x9000 && insType2 == 0)
Console.WriteLine("SNE V" + x + " V" + y);
else if (insType1 == 0xA000)
Console.WriteLine("LD I " + nnn);
else if (insType1 == 0xB000)
Console.WriteLine("JP V0 " + nnn);
else if (insType1 == 0xC000)
Console.WriteLine("RND V" + x + " " + kk);
else if (insType1 == 0xD000)
Console.WriteLine("DRW V" + x + " V" + y + " " + n);
else if (insType1 == 0xE000 && lowbyte == 0x9E)
Console.WriteLine("SKP V" + x);
else if (insType1 == 0xE000 && lowbyte == 0xA1)
Console.WriteLine("SKNP V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x07)
Console.WriteLine("LD V" + x + " DT");
else if (insType1 == 0xF000 && lowbyte == 0x0A)
Console.WriteLine("LD V" + x + " K");
else if (insType1 == 0xF000 && lowbyte == 0x15)
Console.WriteLine("LD DT, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x18)
Console.WriteLine("LD ST, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x1E)
Console.WriteLine("ADD I, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x29)
Console.WriteLine("LD F, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x33)
Console.WriteLine("LD B, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x55)
Console.WriteLine("LD [I], V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x65)
Console.WriteLine("LD V" + x + " [I]");
else
Console.WriteLine("unknown: " + currentRegister.ToString("X"));
pc += 2;
}
}
public List<string> GetCurrentLine()
{
List<string> lines = new List<string>();
for (int i = 0; i < 2 * 5; i += 2)
{
byte lowbyte = ram[(pc + 1) + i];
byte highbyte = ram[(pc) + i];
short currentRegister = BitConverter.ToInt16(new byte[] { lowbyte, highbyte }, 0);
int nnn = currentRegister & (0b0000111111111111);
int n = currentRegister & (0b0000000000001111);
int x = (currentRegister & (0b0000111100000000)) >> 8;
int y = (currentRegister & (0b0000000011110000)) >> 4;
int insType1 = currentRegister & (0b1111000000000000);//highbyte & (0b11110000);
int insType2 = currentRegister & (0b0000000000001111);
byte kk = ram[(pc + 1) + i];
//Console.Write("PC: " + pc + " ");
if (currentRegister == 0x00E0)
lines.Add("CLS");
else if (currentRegister == 0x00EE)
lines.Add("RET");
else if (insType1 == 0x1000)
lines.Add("JP " + nnn);
else if (insType1 == 0x2000)
lines.Add("CALL " + nnn);
else if (insType1 == 0x3000)
lines.Add("SE V" + x + " " + kk);
else if (insType1 == 0x4000)
lines.Add("SNE V" + x + " " + kk);
else if (insType1 == 0x5000)
lines.Add("SE V" + x + " V" + y);
else if (insType1 == 0x6000)
lines.Add("LD V" + x + " " + kk);
else if (insType1 == 0x7000)
lines.Add("ADD V" + x + " " + kk);
else if (insType1 == 0x8000 && insType2 == 0)
lines.Add("LD V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 1)
lines.Add("OR V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 2)
lines.Add("AND V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 3)
lines.Add("XOR V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 4)
lines.Add("ADD V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 5)
lines.Add("SUB V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 6)
lines.Add("SHR V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 7)
lines.Add("SUBN V" + x + " V" + y);
else if (insType1 == 0x8000 && insType2 == 0xE)
lines.Add("SHL V" + x + " V" + y);
else if (insType1 == 0x9000 && insType2 == 0)
lines.Add("SNE V" + x + " V" + y);
else if (insType1 == 0xA000)
lines.Add("LD I " + nnn);
else if (insType1 == 0xB000)
lines.Add("JP V0 " + nnn);
else if (insType1 == 0xC000)
lines.Add("RND V" + x + " " + kk);
else if (insType1 == 0xD000)
lines.Add("DRW V" + x + " V" + y + " " + n);
else if (insType1 == 0xE000 && lowbyte == 0x9E)
lines.Add("SKP V" + x);
else if (insType1 == 0xE000 && lowbyte == 0xA1)
lines.Add("SKNP V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x07)
lines.Add("LD V" + x + " DT");
else if (insType1 == 0xF000 && lowbyte == 0x0A)
lines.Add("LD V" + x + " K");
else if (insType1 == 0xF000 && lowbyte == 0x15)
lines.Add("LD DT, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x18)
lines.Add("LD ST, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x1E)
lines.Add("ADD I, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x29)
lines.Add("LD F, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x33)
lines.Add("LD B, V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x55)
lines.Add("LD [I], V" + x);
else if (insType1 == 0xF000 && lowbyte == 0x65)
lines.Add("LD V" + x + " [I]");
else
lines.Add("unknown: " + currentRegister.ToString("X"));
}
return lines;
}
}
class MainClass
{
static void OnClose(object sender, EventArgs e)
{
// Close the window when OnClose event is received
RenderWindow window = (RenderWindow)sender;
window.Close();
}
public static Chip8 chip8;
public static void OnKeyPressed(object sender, SFML.Window.KeyEventArgs e)
{
for (int i = (int)Keyboard.Key.Num0; i < (int)Keyboard.Key.Escape; i++)
{
if (e.Code == (Keyboard.Key)i)
{
//if(chip8.waitingForInput == 0)
chip8.inputs[i - (int)Keyboard.Key.Num0] = true;
}
// else chip8.inputs[i - (int)Keyboard.Key.Num0] = false;
}
}
public static void OnKeyReleased(object sender, SFML.Window.KeyEventArgs e)
{
for (int i = (int)Keyboard.Key.Num0; i < (int)Keyboard.Key.Escape; i++)
{
if (e.Code == (Keyboard.Key)i)
{
chip8.inputs[i - (int)Keyboard.Key.Num0] = false;
}
// else chip8.inputs[i - (int)Keyboard.Key.Num0] = false;
}
}
public static void Main(string[] args)
{
//Console.WriteLine("Hello World!");
//byte[] loadedCode = File.ReadAllBytes("pong.rom");
byte[] loadedCode = File.ReadAllBytes("INVADERS");
//byte[] loadedCode = File.ReadAllBytes("test_opcode.ch8");
//byte[] loadedCode = File.ReadAllBytes("BC_test.ch8");
chip8 = new Chip8(loadedCode);
RenderWindow app = new RenderWindow(new VideoMode(800, 600), "chip8 emu");
app.Closed += new EventHandler(OnClose);
float TILESIZEX = (float)app.Size.X / 64;
float TILESIZEY = (float)app.Size.Y / 32;
RectangleShape shape = new RectangleShape(new Vector2f(TILESIZEX, TILESIZEY));
app.KeyPressed += OnKeyPressed;
app.KeyReleased += OnKeyReleased;
Font font = new Font("Arial.ttf");
Text text = new Text("", font);
//app.KeyReleased +=
// Start the game loop
//app.SetFramerateLimit(60);
//app.SetVerticalSyncEnabled(true);
while (app.IsOpen)
{
chip8.Execute();
// Process events
app.DispatchEvents();
//if (chip8.displayUpdated)
{
// Clear screen
app.Clear();
for (int y = 0; y < 32; y++)
{
for (int x = 0; x < 64; x++)
{
shape.Position = new Vector2f(x * TILESIZEX, y * TILESIZEY);
if (chip8.display[x, y] == 1)
shape.FillColor = Color.Blue;
else shape.FillColor = Color.Black;
app.Draw(shape);
}
//Console.WriteLine();
}
List<string> lines = chip8.GetCurrentLine();
for (int i = 0; i < lines.Count; i++)
{
text.DisplayedString = lines[i];
text.Position = new Vector2f(0, i * 25);
app.Draw(text);
}
for (int i = 0; i < 16; i++)
{
text.DisplayedString = chip8.inputs[i] ? "1" : "0";
text.Position = new Vector2f((i % 4) * 25 + 200, (i / 4) * 25);
app.Draw(text);
}
app.Display();
chip8.displayUpdated = false;
}
//for (int i = 0; i < 16; i++)
// chip8.inputs[i] = false;
// Draw the sprite
// Draw the string
// Sleep to slow down emulation speed
}
}
}
}